--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/svghmi/syntax.rst	Wed Apr 03 13:02:50 2024 +0200
@@ -0,0 +1,23 @@
+Widget syntax
+=============
+
+.. highlight:: text
+
+HMI elements are SVG elements whose labels start with ``HMI:``::
+
+    HMI:WidgetType[|freq][[:param]...][[@a=path[,min][,max]]...][#expression]
+
+Widget Type
+-----------
+
+Update Frequency
+----------------
+
+Parameters
+----------
+
+Variable bindings
+-----------------
+
+Enable expression
+-----------------
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